Electrically-heated stove unit.



W. s. HADAWAY, JR. ELEOTRIGALLY HEATED STOVE UNIT. APPLICATION FILED JUNE 28, 1909.

1,075,472. I Patented 0015.14, 1913.

4 SHEETS-SHEET 1.

I33 welded WITNESSES: 8 INVENTOR Ir M, M

7 ATTORNEY W. S. HADAWAY, JR. ELBGTRIGALLY HEATED STOVE UNIT.

APPLICATION I 'ILED JUNE 28, 1909.

Patented Oct. 14, 1913.

4 SHEETS-SHEET 2.

g WITNESSES:

' ATTO'RNEY W. s. HADAWAY, JR. ELEGTRIOALLY HEATED STOVE UNIT.

APPLICATION FILED JUNE 28, 1909.

Patented Oct. 14, 1913.

4 SHEETS-SHEET 3.

J'WITNESSES:

INVENTOR AT'TORNEY W. S. HADAWAY, JR.

ELEOTRIGALLY HEATED STOVE UNIT. I

APPLICATION FILED JUNE 18, 1909. I 1,075,472. Patented Oct. 14, 1913.

' v r 4 SHEETS-SHEET 4.

1 ATTORNEY UNITED STA S PATENT OFFICE.

WILLIAM s. HADAWAY, JR, 0F EAST-ORANGE, NEW JERSEY, ASSIGNOR TO WESTING- HOUSE nnncrnro AND MANUFACTURING COMPANY, A CORPORATION OF PE N- SYLVANIA.

I "n EorRIoALLY-HEATEnsTovE UNIT.-

Specification of Letters Patent. Application filed June 28, 1909. Serial No.504,929.

Patented 0a. 14, 19,13;

shall correspond, in general, to one of the lids oricover plates of an' ordinary stove or a base plate 1 of slate or other heat-resistrange.

It is my intention to provide an electrically heated stove unit having a single lid of the ordinary size, the construction being such that several of these stove units may be employed, if desired, to constitute a range of any desired size.

In the accompanying drawings, Figure 1 is a plan view, with the heating element partially broken away, and Fig. 2 a partial sectional elevation, of a device constructed in accordance with my invention. Fig. 3 is a bottom plan view of the controller plate embodiedin the device shown in Figs. 1 and 2. Fig. 4 is a perspective view of-one of the parts and Fig. 5 is a bottom plan view of its supporting frame. Figs. 6, 7 and 8, are

detail views of the resistance element with which the stove unit is provided. Fig. 9 is a View corresponding to Fig. 2, Fig. 10 is a bottom plan view, and Figs. 11 and 12 are detail views, of a modified stove unit structure, Fig. 13 is a diagram showing the circuit connections for the resistance units.

Referring to Figs. 1 to 5, inclusive, of the drawings, the device here shown comprises ing material, an electrically heated lid or cover late 3, a controller plate 4 secured to the lid a movable contact-bearing member 5 and a casing 6. The frame 2 comprises a plurality of legs 7 and a body plate 8, which 18 substantially parallel to the base plate 1 and the lid 3, the base plate 1 being secured to the legs 7 by means of screws 9, and the lid 3 being sup orted on the upper ends of the legs 7, so 1; at the body plate '8 forms a shelf between the two. The controller plate 4 comprises a metal disk 10 to which a plurality of stationary contact members Hand 12 are secured. The lid 3 comprises a pair of metal disks 13 and 13 which are welded together at their edges and between which theresistance element of the device is assembled. The resistance element is illustrated in Figs. 6, 7 and 8, and consists ofinsulating disks 14 and 15 on which flattened helices of resistance stripsor ribbons 16 and 17 are wound,'the disks'being provided with notches 18 to hold the strips in position. The two units thus formed are assembled, face to face, and are separated from each other and from the metal disks 13, between which they are assembled, by means of insulating disks 19. The composition of the disks 14c, 15 and.1-9 is preferably such that enous mass of insulation when heat is ape plied to the assembled device. The upper plate 13, which constitutes the heating surface of the stove unit, is provided with a centrallylocated and downwardly projecting stud or bolt 20 which is preferably weldedfto it and extends through a centrally located hole'in the under plate 13*. The insulating disks and the resistance strips or ribbons are provided with notches 20, as shown in Figs. 6', 7 and 8, to avoid contact with the stud projection 20.

The resistance ribbon 17, as shownin Fig. 8, is provided with an intermediate tap 21 which, together with the terminals of both resistance elements, projects through suit-- able slots 23 in the inner plate. 13. The resistance ribbon preferably corresponds, in structure and arrangement, to the resistance element shown'and described in Patent No. 890,856, granted June 16, 1908 to the Hadaway Electric Heating & Engineering Co.

As shown in Fig. 15, the terminals and the intermediate tap 21 of the resistance ribbon 17 are respectively connected to the contact members 11, and the terminals of the ribbon-16 are respectively connected to one terminalof the resistance ribbon 17 and to the contact member 12. hen the rotative 1 movement of the contact-bearing member 5 is effected, the active portion of the resistance is gradually reduced. The current supplied to the heater element and the powerv transferred into 1 heat is consequently increased in the usual manner. A

70. U they are fused together to form a homog- A stud 24 is screwed upon the bolt 20 and the control plate 4 is pressed upon the stud against a shoulder 25, the arrangement of parts being such that the control plate is slightly separated from, and is parallel to the lid 3. The terminals of the resistance ribbons are severally connected tothe stationary contact members 11 and 12 which are engaged by movable contact members 26 and 27, which; are provided with end terminals 27.

The body plate 8 of the frame 2 is rovided with a centrally located'hole 28 w ich is'adapted to receive the stud 24 and is provided with a flange 29 that is engaged by a shoulder 30 on the stud. The flange 29 is finished to provide a bearing surface for the movable contact-bearing member 5. The member 5 comprises a cross bar 31, contacts 26 and 27, which are of substantially U-shape and are secured to and insulated from the opposite ends of the bar 31, and an actuating lever 32 which is secured to the cross bar 31 and projects outwardly therefrom.

As shown in Fig. 5, a pair of contact ring segments 33' and 34 are secured to the lower side of the body member 8, and the arrangement of parts is such that when the lid .3 and the control plate 10 are-assembled in position, the extremities of the U-shaped contact member 26 respectively engage the contact members 11 and 34, and the extremities of the U-shaped contact member 27 engage the contact members 12 and 33. The stove unit or heater terminals are connected, respectively, to the contact members 33 and 34. The terminals of the resistance ribbons 16 and 17 and the tap 21 are so connected to the contacts of the control plate that, when the stove unit terminals are connected to a constant potential circuit, the amount of heat generated may be adjusted varying the position of the lever 32. A second lever 35 is pivotally secured to the under side of the body member 8 of the frame and is adapted to engage a slot 36 in the stud 24 when it is desired to secure the lid and its attached parts to the stationary frame.

Referring to Figs. 9 and 10, the structure here shown corresponds to that of Figs. 1 and 2 except that the movable contact-bearing member 5 is replaced by a contact arm 35 which carries a terminal 27 that is electrically connected to one of the station ary terminals 33 and 34 by conducting members 43 and 44, and the stove unit is supported by feet 36 whichare punched or stamped from sheet metal and are secured to the casing 6, while the movable cont-act arm 35 is provided with an accentuating device 35*. The accentuating device 35* comprises a steel ball 37 which is suitably seated between a supporting finger 38 and 'to receive the ball.

one end of the arm 35. The ball is pressed against the under surface of the face plate 10, which is provided with a series of inholes 36* dentations or small countersunk A handle 39 (see Figs. 11 and 12), com prising a plurality of washers punched from. scrap mica clamped together, is secured to 'a downwardly extending pro ection 4O of the arm 35*? and extends outwardly therefrom below the casing 6, making it readily I accessible. --In constructing the handle 39, the mica washers 41 are assembled on a tu bular rivet 42 and are pressed together to form a very solid and substantial insulatingbody which may be machine turned and highly polished to have the appearance of amber. The cost of the handle is obviously very small.

ing'contact parts may be used in connection with any one of several different lids which may vary insize and heating capacity to accommodate them to various service conditions. 'The lid 3, or a similar structure, may be readily adapted to other commercial devices, and it is my intention that the scope of the invention shall not be limited to the structures illustrated.

I claim as my invention:

1. An electric heating device comprising a stationary base or support, stationary ccntact members secured thereto, a heater element, a pliirality of contact members electrically connected to said element, a movable contact-bearing arm adjustably mounted on the base, and a pair of bridging contact members secured to and insulated from the contact-bearing arm, said bridging con tact members being adapted to form an electrical connection between the contact members on the base and the contact members connected to the heater element. V

2. An electrical heating device. compris ing a stationary base or support, element removably secured thereto, one set of stationary contact members connected to the heater element, a second set of stationary contact members mounted on the base, and

a movable bridging contact member adapted 7 trically connecting the two sets of contact members.

3. An electric heating device comprising a stationary base or support, a heater element removably secured thereto, stationary contact members respectively connected to the heater element and secured to the stationary base, and adjustable means for electrically connecting the two two sets of contact members.

4. An electric heating device comprising a stationary base or support, a heater element, two sets of stationary contact members respectively connected to the heater element and secured to the base or support and mov- It is evident that the same base and mova heater mounted on the base and a pair of U-shapedcontact members secured to and insulated from the extremities ofvsaid arm, said U- shaped members being adapted to form an electrical connection between the terminal contact members on the base and the :contact members of the heating element.

6. An electric heating device comprising a stationarybase or support, a pair of stationary contact members secured thereto and constituting the terminals of the device, a

heater unit comprising a pair of metal plates welded together, notched. insulating disks, resistance ribbons Wound thereon in the form of flattened helices, a control plate having 'a plurality of stationary contact members secured thereto and insulated therefrom, a

contact-bearing arm adjustably mounted on the base and a pair' of U-shaped contact members secured to and insulated from the ends of the contact-bearing member, said resisting unit being located between and insulated from the-metal plates.

In testimony vwhereof, .I have hereuntosubscribed my name this 5th day of June, e

WILLIAM S. HADAWAY, J R. Witnesses:

R. J. DEARBORN, I B.' B. HINES.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Corrections in Letters, Patent-No. 1,075,4721

Washington, D. 0.

It is hereby certified that in Letters Patent No. 1,075,472, granted October 14,

1913 ,upon the application of William S. Hadaway, ji, of East Orange, New Jersey,

for an improvement in Electrially-Heated Stove Units, errors appear in the printed specification requiring correction as follows: Page 2 strike out lines 116-117 and insert the words to sweep over'b'oth sets of stationam bontact members; same page,

line 124, second occurrence, strike out the word two and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent 'Oifice. I

Signed and sealed this 28th dayof October, A. D., 1913.

Y [SEAL] THOMAS EWING,

Omnmisisioner of Patents. 7 

